java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:10:21,128 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:10:21,131 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:10:21,146 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:10:21,147 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:10:21,148 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:10:21,149 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:10:21,151 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:10:21,153 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:10:21,153 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:10:21,154 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:10:21,155 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:10:21,156 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:10:21,157 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:10:21,158 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:10:21,159 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:10:21,160 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:10:21,161 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:10:21,163 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:10:21,165 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:10:21,166 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:10:21,167 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:10:21,170 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 12:10:21,179 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 12:10:21,197 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:10:21,197 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:10:21,198 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:10:21,198 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:10:21,199 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:10:21,199 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:10:21,199 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:10:21,199 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:10:21,199 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:10:21,200 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:10:21,200 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:10:21,200 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:10:21,201 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:10:21,201 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:10:21,201 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:10:21,201 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:10:21,202 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:10:21,202 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:10:21,202 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:10:21,202 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:10:21,202 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:10:21,203 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:10:21,203 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:10:21,203 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:10:21,203 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:10:21,203 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:10:21,204 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:10:21,204 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:10:21,204 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:10:21,204 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:10:21,204 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:10:21,204 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:10:21,205 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:10:21,205 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:10:21,253 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:10:21,268 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:10:21,272 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:10:21,274 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:10:21,274 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:10:21,275 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i [2018-10-24 12:10:21,327 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b14d63386/759e396357aa438290e9f82e85614d93/FLAG528802830 [2018-10-24 12:10:21,788 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:10:21,790 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i [2018-10-24 12:10:21,798 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b14d63386/759e396357aa438290e9f82e85614d93/FLAG528802830 [2018-10-24 12:10:21,821 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b14d63386/759e396357aa438290e9f82e85614d93 [2018-10-24 12:10:21,834 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:10:21,837 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:10:21,838 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:10:21,839 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:10:21,845 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:10:21,847 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:10:21" (1/1) ... [2018-10-24 12:10:21,849 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6be2feca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:21, skipping insertion in model container [2018-10-24 12:10:21,850 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:10:21" (1/1) ... [2018-10-24 12:10:21,861 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:10:21,885 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:10:22,095 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:10:22,099 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:10:22,128 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:10:22,152 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:10:22,153 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:22 WrapperNode [2018-10-24 12:10:22,153 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:10:22,154 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:10:22,154 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:10:22,156 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:10:22,165 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:22" (1/1) ... [2018-10-24 12:10:22,177 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:22" (1/1) ... [2018-10-24 12:10:22,204 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:10:22,204 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:10:22,204 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:10:22,204 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:10:22,215 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:22" (1/1) ... [2018-10-24 12:10:22,215 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:22" (1/1) ... [2018-10-24 12:10:22,217 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:22" (1/1) ... [2018-10-24 12:10:22,218 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:22" (1/1) ... [2018-10-24 12:10:22,232 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:22" (1/1) ... [2018-10-24 12:10:22,242 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:22" (1/1) ... [2018-10-24 12:10:22,243 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:22" (1/1) ... [2018-10-24 12:10:22,245 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:10:22,246 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:10:22,246 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:10:22,246 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:10:22,247 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:22" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:10:22,392 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:10:22,392 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:10:22,393 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:10:22,393 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:10:22,393 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:10:22,393 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:10:22,393 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:10:22,394 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:10:22,649 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:10:22,649 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:10:22 BoogieIcfgContainer [2018-10-24 12:10:22,650 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:10:22,651 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:10:22,651 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:10:22,655 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:10:22,655 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:10:21" (1/3) ... [2018-10-24 12:10:22,656 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5bfefa48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:10:22, skipping insertion in model container [2018-10-24 12:10:22,656 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:22" (2/3) ... [2018-10-24 12:10:22,659 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5bfefa48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:10:22, skipping insertion in model container [2018-10-24 12:10:22,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:10:22" (3/3) ... [2018-10-24 12:10:22,661 INFO L112 eAbstractionObserver]: Analyzing ICFG array_true-unreach-call2_true-termination.i [2018-10-24 12:10:22,672 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:10:22,684 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:10:22,703 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:10:22,739 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:10:22,739 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:10:22,739 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:10:22,740 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:10:22,740 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:10:22,740 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:10:22,740 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:10:22,740 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:10:22,757 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-10-24 12:10:22,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-24 12:10:22,763 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:22,764 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:22,766 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:22,772 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:22,773 INFO L82 PathProgramCache]: Analyzing trace with hash -173834890, now seen corresponding path program 1 times [2018-10-24 12:10:22,776 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:22,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:22,832 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:22,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:22,832 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:22,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:22,925 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:22,927 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:10:22,928 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:10:22,928 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:10:22,933 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:10:22,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:10:22,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:10:22,951 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2018-10-24 12:10:22,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:22,975 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-24 12:10:22,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:10:22,976 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2018-10-24 12:10:22,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:22,985 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:10:22,985 INFO L226 Difference]: Without dead ends: 15 [2018-10-24 12:10:22,989 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:10:23,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-24 12:10:23,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-24 12:10:23,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-24 12:10:23,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-24 12:10:23,027 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-10-24 12:10:23,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:23,028 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-24 12:10:23,028 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:10:23,028 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-24 12:10:23,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:10:23,029 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:23,029 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:23,029 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:23,030 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:23,030 INFO L82 PathProgramCache]: Analyzing trace with hash -737648989, now seen corresponding path program 1 times [2018-10-24 12:10:23,030 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:23,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:23,031 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:23,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:23,032 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:23,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:23,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:23,174 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:10:23,174 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:10:23,174 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:10:23,176 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:10:23,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:10:23,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:10:23,177 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 3 states. [2018-10-24 12:10:23,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:23,257 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-24 12:10:23,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:10:23,258 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-10-24 12:10:23,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:23,259 INFO L225 Difference]: With dead ends: 24 [2018-10-24 12:10:23,259 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 12:10:23,260 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:10:23,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 12:10:23,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-24 12:10:23,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-24 12:10:23,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-24 12:10:23,265 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2018-10-24 12:10:23,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:23,266 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-24 12:10:23,266 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:10:23,266 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-24 12:10:23,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 12:10:23,267 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:23,267 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:23,267 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:23,267 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:23,268 INFO L82 PathProgramCache]: Analyzing trace with hash -1154592614, now seen corresponding path program 1 times [2018-10-24 12:10:23,268 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:23,269 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:23,269 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:23,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:23,270 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:23,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:23,374 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:23,374 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:23,374 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:23,377 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-10-24 12:10:23,379 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [35], [36], [37], [39] [2018-10-24 12:10:23,428 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:10:23,428 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:10:24,285 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:10:24,286 INFO L272 AbstractInterpreter]: Visited 15 different actions 43 times. Merged at 3 different actions 21 times. Widened at 1 different actions 3 times. Found 1 fixpoints after 1 different actions. Largest state had 34 variables. [2018-10-24 12:10:24,313 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:24,314 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:10:24,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:24,315 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:24,329 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:24,329 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:24,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:24,390 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:24,432 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:24,433 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:24,545 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:24,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:24,567 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-10-24 12:10:24,567 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:24,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:10:24,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:10:24,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:10:24,568 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 5 states. [2018-10-24 12:10:24,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:24,651 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-24 12:10:24,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:10:24,652 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2018-10-24 12:10:24,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:24,653 INFO L225 Difference]: With dead ends: 27 [2018-10-24 12:10:24,653 INFO L226 Difference]: Without dead ends: 21 [2018-10-24 12:10:24,654 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:10:24,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-24 12:10:24,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2018-10-24 12:10:24,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 12:10:24,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-24 12:10:24,659 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2018-10-24 12:10:24,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:24,660 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-24 12:10:24,660 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:10:24,660 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-24 12:10:24,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 12:10:24,661 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:24,661 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:24,661 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:24,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:24,662 INFO L82 PathProgramCache]: Analyzing trace with hash -1276704957, now seen corresponding path program 2 times [2018-10-24 12:10:24,662 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:24,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:24,663 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:24,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:24,664 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:24,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:24,904 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:24,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:24,905 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:24,905 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:24,905 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:24,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:24,906 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:24,923 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:24,923 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:25,013 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:10:25,013 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:25,016 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:25,072 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:25,073 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:25,252 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:25,274 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:25,274 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-24 12:10:25,274 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:25,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:10:25,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:10:25,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:10:25,276 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 6 states. [2018-10-24 12:10:25,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:25,342 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-24 12:10:25,342 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:10:25,342 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-10-24 12:10:25,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:25,343 INFO L225 Difference]: With dead ends: 30 [2018-10-24 12:10:25,344 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 12:10:25,344 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:10:25,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 12:10:25,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-10-24 12:10:25,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-24 12:10:25,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-24 12:10:25,350 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2018-10-24 12:10:25,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:25,350 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-24 12:10:25,350 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:10:25,350 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-24 12:10:25,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-24 12:10:25,351 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:25,352 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:25,352 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:25,352 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:25,352 INFO L82 PathProgramCache]: Analyzing trace with hash -1288215558, now seen corresponding path program 3 times [2018-10-24 12:10:25,352 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:25,353 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:25,353 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:25,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:25,354 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:25,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:25,517 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:25,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:25,518 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:25,518 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:25,518 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:25,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:25,519 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:25,533 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:25,534 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:25,576 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:25,577 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:25,579 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:25,600 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:25,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:25,704 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:25,730 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:25,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-10-24 12:10:25,731 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:25,731 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:10:25,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:10:25,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:10:25,732 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 7 states. [2018-10-24 12:10:25,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:25,779 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-24 12:10:25,779 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:10:25,779 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2018-10-24 12:10:25,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:25,780 INFO L225 Difference]: With dead ends: 33 [2018-10-24 12:10:25,780 INFO L226 Difference]: Without dead ends: 27 [2018-10-24 12:10:25,781 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:10:25,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-24 12:10:25,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-24 12:10:25,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 12:10:25,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-24 12:10:25,787 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2018-10-24 12:10:25,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:25,787 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-24 12:10:25,787 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:10:25,788 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-24 12:10:25,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:10:25,788 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:25,789 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:25,789 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:25,789 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:25,790 INFO L82 PathProgramCache]: Analyzing trace with hash -603146269, now seen corresponding path program 4 times [2018-10-24 12:10:25,790 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:25,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:25,791 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:25,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:25,791 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:25,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:25,944 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:25,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:25,945 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:25,945 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:25,946 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:25,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:25,946 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:25,958 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:25,958 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:26,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:26,009 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:26,123 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:26,124 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:26,450 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:26,475 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:26,475 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-24 12:10:26,475 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:26,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:10:26,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:10:26,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:10:26,476 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 8 states. [2018-10-24 12:10:26,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:26,525 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-24 12:10:26,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:10:26,529 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-10-24 12:10:26,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:26,530 INFO L225 Difference]: With dead ends: 36 [2018-10-24 12:10:26,530 INFO L226 Difference]: Without dead ends: 30 [2018-10-24 12:10:26,531 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:10:26,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-24 12:10:26,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-24 12:10:26,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 12:10:26,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-24 12:10:26,537 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2018-10-24 12:10:26,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:26,537 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-24 12:10:26,537 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:10:26,537 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-24 12:10:26,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-24 12:10:26,538 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:26,538 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:26,539 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:26,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:26,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1388548262, now seen corresponding path program 5 times [2018-10-24 12:10:26,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:26,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:26,540 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:26,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:26,541 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:26,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:26,698 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:26,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:26,699 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:26,699 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:26,700 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:26,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:26,700 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:26,715 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:26,715 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:26,795 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:10:26,795 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:26,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:26,825 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:26,825 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:27,067 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:27,099 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:27,100 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-24 12:10:27,100 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:27,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:10:27,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:10:27,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:10:27,102 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 9 states. [2018-10-24 12:10:27,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:27,214 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-24 12:10:27,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:10:27,215 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2018-10-24 12:10:27,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:27,217 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:10:27,217 INFO L226 Difference]: Without dead ends: 33 [2018-10-24 12:10:27,218 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:10:27,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-24 12:10:27,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-24 12:10:27,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 12:10:27,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-24 12:10:27,223 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2018-10-24 12:10:27,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:27,224 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-24 12:10:27,224 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:10:27,224 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-24 12:10:27,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 12:10:27,225 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:27,225 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:27,225 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:27,226 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:27,226 INFO L82 PathProgramCache]: Analyzing trace with hash -317493117, now seen corresponding path program 6 times [2018-10-24 12:10:27,226 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:27,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:27,227 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:27,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:27,227 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:27,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:27,720 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:27,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:27,721 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:27,721 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:27,721 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:27,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:27,722 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:27,731 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:27,731 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:27,781 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:27,781 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:27,784 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:27,797 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:27,797 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:28,004 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:28,026 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:28,026 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-10-24 12:10:28,026 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:28,027 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:10:28,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:10:28,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:10:28,028 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 10 states. [2018-10-24 12:10:28,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:28,084 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-24 12:10:28,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:10:28,085 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-10-24 12:10:28,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:28,086 INFO L225 Difference]: With dead ends: 42 [2018-10-24 12:10:28,087 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 12:10:28,087 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:10:28,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 12:10:28,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-24 12:10:28,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-24 12:10:28,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-24 12:10:28,093 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2018-10-24 12:10:28,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:28,093 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-24 12:10:28,094 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:10:28,094 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-24 12:10:28,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-24 12:10:28,095 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:28,095 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:28,095 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:28,095 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:28,095 INFO L82 PathProgramCache]: Analyzing trace with hash 174289594, now seen corresponding path program 7 times [2018-10-24 12:10:28,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:28,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:28,096 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:28,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:28,097 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:28,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:28,261 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:28,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:28,261 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:28,262 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:28,262 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:28,262 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:28,262 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:28,271 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:28,271 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:28,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:28,319 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:28,347 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:28,348 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:28,595 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:28,617 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:28,617 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-24 12:10:28,617 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:28,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:10:28,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:10:28,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:10:28,618 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 11 states. [2018-10-24 12:10:28,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:28,672 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-24 12:10:28,673 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:10:28,673 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 34 [2018-10-24 12:10:28,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:28,675 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:10:28,675 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 12:10:28,676 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:10:28,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 12:10:28,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-24 12:10:28,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 12:10:28,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-24 12:10:28,681 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2018-10-24 12:10:28,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:28,681 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-24 12:10:28,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:10:28,682 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-24 12:10:28,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 12:10:28,682 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:28,682 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:28,683 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:28,683 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:28,683 INFO L82 PathProgramCache]: Analyzing trace with hash 739586339, now seen corresponding path program 8 times [2018-10-24 12:10:28,683 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:28,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:28,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:28,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:28,684 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:28,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:28,827 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:28,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:28,827 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:28,828 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:28,828 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:28,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:28,829 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:28,838 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:28,838 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:28,949 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:10:28,949 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:28,953 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:29,031 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:29,031 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:29,254 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:29,274 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:29,275 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-24 12:10:29,275 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:29,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:10:29,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:10:29,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:10:29,276 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 12 states. [2018-10-24 12:10:29,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:29,400 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-24 12:10:29,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:10:29,402 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 37 [2018-10-24 12:10:29,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:29,404 INFO L225 Difference]: With dead ends: 48 [2018-10-24 12:10:29,404 INFO L226 Difference]: Without dead ends: 42 [2018-10-24 12:10:29,405 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:10:29,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-24 12:10:29,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-24 12:10:29,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-24 12:10:29,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-24 12:10:29,411 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2018-10-24 12:10:29,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:29,411 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-24 12:10:29,411 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:10:29,411 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-24 12:10:29,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-24 12:10:29,412 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:29,413 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:29,413 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:29,413 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:29,413 INFO L82 PathProgramCache]: Analyzing trace with hash 928149018, now seen corresponding path program 9 times [2018-10-24 12:10:29,413 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:29,414 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:29,414 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:29,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:29,415 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:29,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:29,882 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:29,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:29,882 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:29,883 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:29,883 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:29,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:29,883 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:29,891 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:29,891 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:29,940 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:29,941 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:29,943 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:29,965 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:29,965 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:30,298 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:30,319 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:30,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2018-10-24 12:10:30,320 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:30,320 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:10:30,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:10:30,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:10:30,321 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 13 states. [2018-10-24 12:10:30,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:30,376 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-24 12:10:30,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:10:30,377 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 40 [2018-10-24 12:10:30,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:30,378 INFO L225 Difference]: With dead ends: 51 [2018-10-24 12:10:30,378 INFO L226 Difference]: Without dead ends: 45 [2018-10-24 12:10:30,379 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:10:30,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-24 12:10:30,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-24 12:10:30,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-24 12:10:30,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-24 12:10:30,383 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2018-10-24 12:10:30,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:30,384 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-24 12:10:30,384 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:10:30,384 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-24 12:10:30,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-24 12:10:30,385 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:30,385 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:30,385 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:30,385 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:30,385 INFO L82 PathProgramCache]: Analyzing trace with hash 581695939, now seen corresponding path program 10 times [2018-10-24 12:10:30,386 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:30,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:30,386 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:30,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:30,387 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:30,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:30,583 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:30,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:30,584 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:30,584 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:30,585 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:30,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:30,585 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:30,602 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:30,602 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:30,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:30,655 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:30,746 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:30,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:31,097 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:31,121 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:31,121 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-24 12:10:31,121 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:31,122 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:10:31,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:10:31,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:10:31,123 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 14 states. [2018-10-24 12:10:31,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:31,186 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-24 12:10:31,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:10:31,188 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 43 [2018-10-24 12:10:31,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:31,189 INFO L225 Difference]: With dead ends: 54 [2018-10-24 12:10:31,189 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 12:10:31,190 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:10:31,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 12:10:31,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-10-24 12:10:31,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-24 12:10:31,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-10-24 12:10:31,194 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2018-10-24 12:10:31,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:31,195 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-10-24 12:10:31,195 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:10:31,195 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-10-24 12:10:31,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 12:10:31,196 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:31,196 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:31,196 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:31,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:31,196 INFO L82 PathProgramCache]: Analyzing trace with hash 204431738, now seen corresponding path program 11 times [2018-10-24 12:10:31,197 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:31,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:31,197 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:31,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:31,198 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:31,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:31,506 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:31,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:31,507 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:31,507 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:31,507 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:31,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:31,507 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:31,515 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:31,515 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:31,677 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:10:31,678 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:31,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:31,721 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:31,721 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:32,033 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:32,054 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:32,055 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-24 12:10:32,055 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:32,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:10:32,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:10:32,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:10:32,056 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 15 states. [2018-10-24 12:10:32,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:32,229 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-24 12:10:32,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:10:32,229 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 46 [2018-10-24 12:10:32,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:32,230 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:10:32,230 INFO L226 Difference]: Without dead ends: 51 [2018-10-24 12:10:32,232 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:10:32,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-24 12:10:32,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-10-24 12:10:32,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 12:10:32,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-24 12:10:32,237 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 46 [2018-10-24 12:10:32,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:32,238 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-24 12:10:32,238 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:10:32,238 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-24 12:10:32,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:10:32,239 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:32,239 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:32,239 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:32,239 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:32,239 INFO L82 PathProgramCache]: Analyzing trace with hash 1056033379, now seen corresponding path program 12 times [2018-10-24 12:10:32,240 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:32,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:32,240 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:32,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:32,241 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:32,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:32,431 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:32,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:32,431 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:32,431 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:32,431 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:32,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:32,432 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:32,440 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:32,440 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:32,494 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:32,494 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:32,497 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:32,516 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:32,516 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:32,797 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:32,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:32,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-10-24 12:10:32,818 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:32,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:10:32,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:10:32,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:10:32,819 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 16 states. [2018-10-24 12:10:32,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:32,948 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-24 12:10:32,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:10:32,949 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 49 [2018-10-24 12:10:32,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:32,950 INFO L225 Difference]: With dead ends: 60 [2018-10-24 12:10:32,950 INFO L226 Difference]: Without dead ends: 54 [2018-10-24 12:10:32,951 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:10:32,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-24 12:10:32,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-24 12:10:32,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-24 12:10:32,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-10-24 12:10:32,956 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 49 [2018-10-24 12:10:32,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:32,957 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-10-24 12:10:32,957 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:10:32,957 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-10-24 12:10:32,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-24 12:10:32,958 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:32,958 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:32,958 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:32,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:32,958 INFO L82 PathProgramCache]: Analyzing trace with hash 748702938, now seen corresponding path program 13 times [2018-10-24 12:10:32,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:32,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:32,959 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:32,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:32,960 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:32,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:33,297 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:33,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:33,297 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:33,297 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:33,297 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:33,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:33,297 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:33,305 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:33,305 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:33,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:33,369 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:33,388 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:33,388 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:33,745 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:33,765 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:33,765 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-24 12:10:33,765 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:33,766 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:10:33,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:10:33,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:10:33,767 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 17 states. [2018-10-24 12:10:33,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:33,861 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-24 12:10:33,861 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:10:33,861 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 52 [2018-10-24 12:10:33,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:33,863 INFO L225 Difference]: With dead ends: 63 [2018-10-24 12:10:33,863 INFO L226 Difference]: Without dead ends: 57 [2018-10-24 12:10:33,864 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:10:33,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-24 12:10:33,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-10-24 12:10:33,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-24 12:10:33,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-24 12:10:33,869 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 52 [2018-10-24 12:10:33,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:33,870 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-24 12:10:33,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:10:33,870 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-24 12:10:33,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-24 12:10:33,871 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:33,871 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:33,871 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:33,871 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:33,871 INFO L82 PathProgramCache]: Analyzing trace with hash 1937810179, now seen corresponding path program 14 times [2018-10-24 12:10:33,871 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:33,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:33,872 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:33,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:33,872 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:33,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:34,720 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:34,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:34,721 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:34,721 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:34,721 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:34,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:34,721 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:34,728 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:34,729 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:35,030 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:10:35,030 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:35,033 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:35,061 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:35,062 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:35,638 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:35,659 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:35,659 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-24 12:10:35,659 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:35,659 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:10:35,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:10:35,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:10:35,661 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 18 states. [2018-10-24 12:10:35,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:35,764 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-24 12:10:35,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:10:35,764 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 55 [2018-10-24 12:10:35,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:35,766 INFO L225 Difference]: With dead ends: 66 [2018-10-24 12:10:35,766 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 12:10:35,767 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:10:35,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 12:10:35,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-10-24 12:10:35,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-24 12:10:35,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-10-24 12:10:35,772 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 55 [2018-10-24 12:10:35,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:35,773 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-10-24 12:10:35,773 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:10:35,773 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-10-24 12:10:35,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-24 12:10:35,774 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:35,774 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:35,775 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:35,775 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:35,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1741369402, now seen corresponding path program 15 times [2018-10-24 12:10:35,775 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:35,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:35,776 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:35,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:35,776 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:35,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:36,550 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:36,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:36,551 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:36,551 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:36,551 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:36,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:36,551 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:36,559 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:36,559 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:36,634 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:36,634 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:36,638 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:36,682 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:36,682 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:37,569 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:37,590 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:37,591 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2018-10-24 12:10:37,591 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:37,591 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:10:37,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:10:37,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:10:37,592 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 19 states. [2018-10-24 12:10:37,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:37,715 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-24 12:10:37,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:10:37,715 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 58 [2018-10-24 12:10:37,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:37,716 INFO L225 Difference]: With dead ends: 69 [2018-10-24 12:10:37,716 INFO L226 Difference]: Without dead ends: 63 [2018-10-24 12:10:37,717 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:10:37,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-24 12:10:37,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2018-10-24 12:10:37,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-24 12:10:37,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-10-24 12:10:37,727 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 58 [2018-10-24 12:10:37,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:37,728 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-10-24 12:10:37,728 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:10:37,728 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-10-24 12:10:37,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-24 12:10:37,729 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:37,729 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:37,729 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:37,729 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:37,730 INFO L82 PathProgramCache]: Analyzing trace with hash -680361053, now seen corresponding path program 16 times [2018-10-24 12:10:37,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:37,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:37,731 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:37,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:37,731 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:37,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:38,009 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:38,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:38,010 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:38,010 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:38,010 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:38,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:38,010 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:38,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:38,018 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:38,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:38,092 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:38,118 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:38,119 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:38,976 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:39,003 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:39,003 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-24 12:10:39,003 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:39,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:10:39,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:10:39,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:10:39,005 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 20 states. [2018-10-24 12:10:39,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:39,091 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-24 12:10:39,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:10:39,092 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 61 [2018-10-24 12:10:39,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:39,093 INFO L225 Difference]: With dead ends: 72 [2018-10-24 12:10:39,093 INFO L226 Difference]: Without dead ends: 66 [2018-10-24 12:10:39,094 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:10:39,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-24 12:10:39,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2018-10-24 12:10:39,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-24 12:10:39,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-10-24 12:10:39,100 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 61 [2018-10-24 12:10:39,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:39,100 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-10-24 12:10:39,100 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:10:39,100 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-10-24 12:10:39,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-24 12:10:39,101 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:39,102 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:39,102 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:39,102 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:39,102 INFO L82 PathProgramCache]: Analyzing trace with hash 408292250, now seen corresponding path program 17 times [2018-10-24 12:10:39,102 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:39,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:39,103 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:39,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:39,103 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:39,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:39,565 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:39,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:39,565 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:39,566 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:39,566 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:39,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:39,566 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:39,579 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:39,579 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:40,148 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:10:40,148 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:40,152 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:40,171 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:40,171 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:40,681 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:40,715 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:40,715 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-24 12:10:40,715 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:40,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:10:40,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:10:40,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:10:40,717 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 21 states. [2018-10-24 12:10:40,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:40,879 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-24 12:10:40,880 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:10:40,880 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 64 [2018-10-24 12:10:40,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:40,881 INFO L225 Difference]: With dead ends: 75 [2018-10-24 12:10:40,881 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:10:40,882 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:10:40,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:10:40,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-10-24 12:10:40,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-24 12:10:40,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-10-24 12:10:40,887 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 64 [2018-10-24 12:10:40,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:40,887 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-10-24 12:10:40,887 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:10:40,887 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-10-24 12:10:40,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-24 12:10:40,888 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:40,888 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:40,893 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:40,893 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:40,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1180789827, now seen corresponding path program 18 times [2018-10-24 12:10:40,893 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:40,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:40,894 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:40,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:40,894 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:40,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:41,479 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:41,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:41,480 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:41,480 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:41,480 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:41,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:41,480 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:41,488 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:41,488 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:41,577 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:41,577 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:41,581 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:41,683 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:41,683 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:42,105 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:42,126 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:42,126 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-10-24 12:10:42,126 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:42,127 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:10:42,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:10:42,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:10:42,128 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 22 states. [2018-10-24 12:10:42,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:42,214 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-24 12:10:42,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:10:42,218 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 67 [2018-10-24 12:10:42,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:42,219 INFO L225 Difference]: With dead ends: 78 [2018-10-24 12:10:42,219 INFO L226 Difference]: Without dead ends: 72 [2018-10-24 12:10:42,219 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:10:42,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-24 12:10:42,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2018-10-24 12:10:42,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-24 12:10:42,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-10-24 12:10:42,224 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 67 [2018-10-24 12:10:42,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:42,224 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-10-24 12:10:42,224 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:10:42,224 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-10-24 12:10:42,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-10-24 12:10:42,225 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:42,225 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:42,225 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:42,225 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:42,225 INFO L82 PathProgramCache]: Analyzing trace with hash -2073633030, now seen corresponding path program 19 times [2018-10-24 12:10:42,226 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:42,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:42,226 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:42,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:42,226 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:42,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:43,022 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:43,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:43,022 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:43,022 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:43,022 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:43,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:43,023 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:43,032 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:43,033 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:43,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:43,112 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:43,132 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:43,132 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:43,829 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:43,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:43,851 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-24 12:10:43,851 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:43,851 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:10:43,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:10:43,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:10:43,853 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 23 states. [2018-10-24 12:10:43,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:43,950 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-24 12:10:43,950 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:10:43,950 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 70 [2018-10-24 12:10:43,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:43,952 INFO L225 Difference]: With dead ends: 81 [2018-10-24 12:10:43,952 INFO L226 Difference]: Without dead ends: 75 [2018-10-24 12:10:43,953 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:10:43,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-24 12:10:43,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-10-24 12:10:43,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-24 12:10:43,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2018-10-24 12:10:43,957 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 70 [2018-10-24 12:10:43,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:43,958 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2018-10-24 12:10:43,958 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:10:43,958 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2018-10-24 12:10:43,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-24 12:10:43,959 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:43,959 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:43,959 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:43,960 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:43,960 INFO L82 PathProgramCache]: Analyzing trace with hash 6773987, now seen corresponding path program 20 times [2018-10-24 12:10:43,960 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:43,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:43,961 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:43,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:43,961 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:43,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:44,396 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:44,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:44,397 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:44,397 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:44,397 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:44,397 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:44,397 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:44,406 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:44,406 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:46,106 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-24 12:10:46,106 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:46,115 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:46,136 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:46,136 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:46,970 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:46,993 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:46,993 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-24 12:10:46,993 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:46,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:10:46,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:10:46,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:10:46,995 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand 24 states. [2018-10-24 12:10:47,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:47,106 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-24 12:10:47,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:10:47,109 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 73 [2018-10-24 12:10:47,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:47,110 INFO L225 Difference]: With dead ends: 84 [2018-10-24 12:10:47,110 INFO L226 Difference]: Without dead ends: 78 [2018-10-24 12:10:47,112 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:10:47,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-24 12:10:47,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-10-24 12:10:47,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-24 12:10:47,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-10-24 12:10:47,116 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 73 [2018-10-24 12:10:47,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:47,116 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-10-24 12:10:47,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:10:47,116 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-10-24 12:10:47,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-24 12:10:47,117 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:47,118 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:47,118 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:47,118 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:47,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1034136154, now seen corresponding path program 21 times [2018-10-24 12:10:47,118 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:47,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:47,119 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:47,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:47,119 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:47,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:47,495 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:47,495 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:47,495 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:47,496 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:47,496 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:47,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:47,496 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:47,503 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:47,503 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:47,585 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:47,585 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:47,588 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:47,614 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:47,614 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:48,294 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:48,314 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:48,315 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2018-10-24 12:10:48,315 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:48,315 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:10:48,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:10:48,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:10:48,316 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 25 states. [2018-10-24 12:10:48,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:48,407 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-24 12:10:48,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:10:48,410 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 76 [2018-10-24 12:10:48,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:48,410 INFO L225 Difference]: With dead ends: 87 [2018-10-24 12:10:48,410 INFO L226 Difference]: Without dead ends: 81 [2018-10-24 12:10:48,411 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:10:48,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-24 12:10:48,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2018-10-24 12:10:48,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-24 12:10:48,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 80 transitions. [2018-10-24 12:10:48,414 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 80 transitions. Word has length 76 [2018-10-24 12:10:48,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:48,414 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 80 transitions. [2018-10-24 12:10:48,414 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:10:48,414 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 80 transitions. [2018-10-24 12:10:48,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:10:48,415 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:48,415 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:48,415 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:48,416 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:48,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1243501955, now seen corresponding path program 22 times [2018-10-24 12:10:48,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:48,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:48,417 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:48,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:48,417 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:48,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:48,723 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:48,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:48,724 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:48,724 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:48,724 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:48,724 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:48,724 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:48,738 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:48,738 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:48,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:48,828 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:48,896 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:48,896 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:49,493 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:49,513 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:49,513 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-24 12:10:49,513 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:49,514 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:10:49,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:10:49,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:10:49,515 INFO L87 Difference]: Start difference. First operand 80 states and 80 transitions. Second operand 26 states. [2018-10-24 12:10:49,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:49,657 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-24 12:10:49,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:10:49,657 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 79 [2018-10-24 12:10:49,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:49,659 INFO L225 Difference]: With dead ends: 90 [2018-10-24 12:10:49,659 INFO L226 Difference]: Without dead ends: 84 [2018-10-24 12:10:49,660 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:10:49,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-24 12:10:49,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2018-10-24 12:10:49,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-24 12:10:49,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-10-24 12:10:49,664 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 79 [2018-10-24 12:10:49,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:49,664 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-10-24 12:10:49,664 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:10:49,665 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-10-24 12:10:49,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-10-24 12:10:49,665 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:49,665 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:49,666 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:49,666 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:49,666 INFO L82 PathProgramCache]: Analyzing trace with hash -2127401542, now seen corresponding path program 23 times [2018-10-24 12:10:49,666 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:49,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:49,667 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:49,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:49,667 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:49,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:50,367 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:50,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:50,367 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:50,367 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:50,368 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:50,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:50,368 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:50,378 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:50,378 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:01,347 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-24 12:11:01,347 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:01,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:01,384 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:01,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:02,327 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:02,350 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:02,350 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-24 12:11:02,351 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:02,351 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:11:02,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:11:02,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:11:02,352 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 27 states. [2018-10-24 12:11:02,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:02,462 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-24 12:11:02,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:11:02,463 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 82 [2018-10-24 12:11:02,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:02,464 INFO L225 Difference]: With dead ends: 93 [2018-10-24 12:11:02,464 INFO L226 Difference]: Without dead ends: 87 [2018-10-24 12:11:02,466 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:11:02,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-24 12:11:02,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-10-24 12:11:02,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-10-24 12:11:02,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 86 transitions. [2018-10-24 12:11:02,469 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 86 transitions. Word has length 82 [2018-10-24 12:11:02,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:02,470 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 86 transitions. [2018-10-24 12:11:02,470 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:11:02,470 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 86 transitions. [2018-10-24 12:11:02,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-24 12:11:02,471 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:02,471 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:02,471 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:02,471 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:02,471 INFO L82 PathProgramCache]: Analyzing trace with hash 211834403, now seen corresponding path program 24 times [2018-10-24 12:11:02,472 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:02,472 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:02,472 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:02,472 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:02,472 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:02,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:03,300 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:03,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:03,301 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:03,301 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:03,301 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:03,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:03,301 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:03,308 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:03,308 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:03,399 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:03,399 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:03,403 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:03,443 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:03,444 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:04,231 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:04,252 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:04,253 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-10-24 12:11:04,253 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:04,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:11:04,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:11:04,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-24 12:11:04,255 INFO L87 Difference]: Start difference. First operand 86 states and 86 transitions. Second operand 28 states. [2018-10-24 12:11:04,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:04,377 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-24 12:11:04,378 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:11:04,378 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 85 [2018-10-24 12:11:04,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:04,379 INFO L225 Difference]: With dead ends: 96 [2018-10-24 12:11:04,380 INFO L226 Difference]: Without dead ends: 90 [2018-10-24 12:11:04,382 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-24 12:11:04,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-24 12:11:04,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-10-24 12:11:04,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:11:04,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-10-24 12:11:04,385 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 85 [2018-10-24 12:11:04,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:04,385 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-10-24 12:11:04,385 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:11:04,385 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-10-24 12:11:04,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-10-24 12:11:04,386 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:04,386 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:04,386 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:04,386 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:04,387 INFO L82 PathProgramCache]: Analyzing trace with hash -1749472998, now seen corresponding path program 25 times [2018-10-24 12:11:04,387 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:04,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:04,387 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:04,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:04,388 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:04,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:05,180 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:05,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:05,180 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:05,180 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:05,180 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:05,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:05,181 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:05,188 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:05,188 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:05,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:05,289 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:05,317 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:05,317 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:06,520 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:06,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:06,543 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-24 12:11:06,543 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:06,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:11:06,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:11:06,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:11:06,545 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 29 states. [2018-10-24 12:11:06,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:06,642 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-24 12:11:06,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:11:06,642 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 88 [2018-10-24 12:11:06,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:06,643 INFO L225 Difference]: With dead ends: 99 [2018-10-24 12:11:06,644 INFO L226 Difference]: Without dead ends: 93 [2018-10-24 12:11:06,646 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:11:06,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-24 12:11:06,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2018-10-24 12:11:06,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-24 12:11:06,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 92 transitions. [2018-10-24 12:11:06,649 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 92 transitions. Word has length 88 [2018-10-24 12:11:06,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:06,650 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 92 transitions. [2018-10-24 12:11:06,650 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:11:06,650 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 92 transitions. [2018-10-24 12:11:06,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-10-24 12:11:06,651 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:06,651 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:06,651 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:06,651 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:06,651 INFO L82 PathProgramCache]: Analyzing trace with hash 1971805891, now seen corresponding path program 26 times [2018-10-24 12:11:06,651 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:06,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:06,652 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:06,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:06,652 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:06,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:07,383 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:07,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:07,383 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:07,383 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:07,383 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:07,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:07,384 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:07,391 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:07,391 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:16,145 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-24 12:11:16,145 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:16,154 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:16,177 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:16,178 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:17,453 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:17,477 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:17,477 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-24 12:11:17,478 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:17,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:11:17,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:11:17,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:11:17,480 INFO L87 Difference]: Start difference. First operand 92 states and 92 transitions. Second operand 30 states. [2018-10-24 12:11:17,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:17,613 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-24 12:11:17,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:11:17,614 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 91 [2018-10-24 12:11:17,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:17,615 INFO L225 Difference]: With dead ends: 102 [2018-10-24 12:11:17,615 INFO L226 Difference]: Without dead ends: 96 [2018-10-24 12:11:17,617 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:11:17,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-24 12:11:17,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2018-10-24 12:11:17,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-10-24 12:11:17,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-10-24 12:11:17,621 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 91 [2018-10-24 12:11:17,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:17,622 INFO L481 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-10-24 12:11:17,622 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:11:17,622 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-10-24 12:11:17,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-10-24 12:11:17,622 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:17,623 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:17,623 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:17,623 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:17,623 INFO L82 PathProgramCache]: Analyzing trace with hash 895343738, now seen corresponding path program 27 times [2018-10-24 12:11:17,623 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:17,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:17,624 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:17,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:17,624 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:17,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:18,114 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:18,114 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:18,114 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:18,114 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:18,115 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:18,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:18,115 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:18,123 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:18,124 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:18,229 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:18,230 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:18,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:18,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:18,257 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:19,220 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:19,241 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:19,241 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2018-10-24 12:11:19,241 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:19,241 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:11:19,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:11:19,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:11:19,242 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 31 states. [2018-10-24 12:11:19,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:19,410 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-24 12:11:19,410 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:11:19,411 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 94 [2018-10-24 12:11:19,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:19,411 INFO L225 Difference]: With dead ends: 105 [2018-10-24 12:11:19,412 INFO L226 Difference]: Without dead ends: 99 [2018-10-24 12:11:19,412 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:11:19,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-24 12:11:19,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-10-24 12:11:19,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-10-24 12:11:19,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 98 transitions. [2018-10-24 12:11:19,415 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 98 transitions. Word has length 94 [2018-10-24 12:11:19,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:19,416 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 98 transitions. [2018-10-24 12:11:19,416 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:11:19,416 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 98 transitions. [2018-10-24 12:11:19,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-24 12:11:19,417 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:19,417 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:19,417 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:19,417 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:19,417 INFO L82 PathProgramCache]: Analyzing trace with hash -1762824349, now seen corresponding path program 28 times [2018-10-24 12:11:19,418 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:19,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:19,418 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:19,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:19,419 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:19,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:20,793 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:20,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:20,793 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:20,793 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:20,794 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:20,794 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:20,794 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:20,802 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:20,802 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:20,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:20,903 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:20,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:20,920 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:21,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:21,906 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:21,907 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-24 12:11:21,907 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:21,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:11:21,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:11:21,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:11:21,908 INFO L87 Difference]: Start difference. First operand 98 states and 98 transitions. Second operand 32 states. [2018-10-24 12:11:22,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:22,069 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-24 12:11:22,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:11:22,069 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 97 [2018-10-24 12:11:22,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:22,070 INFO L225 Difference]: With dead ends: 108 [2018-10-24 12:11:22,070 INFO L226 Difference]: Without dead ends: 102 [2018-10-24 12:11:22,071 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:11:22,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-24 12:11:22,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2018-10-24 12:11:22,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-24 12:11:22,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-10-24 12:11:22,075 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 97 [2018-10-24 12:11:22,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:22,075 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-10-24 12:11:22,075 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:11:22,075 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-10-24 12:11:22,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-10-24 12:11:22,076 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:22,076 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:22,076 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:22,076 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:22,077 INFO L82 PathProgramCache]: Analyzing trace with hash -641300518, now seen corresponding path program 29 times [2018-10-24 12:11:22,077 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:22,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:22,077 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:22,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:22,078 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:22,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:22,647 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:22,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:22,647 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:22,648 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:22,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:22,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:22,648 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:22,675 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:22,675 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:44,803 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-24 12:11:44,804 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:44,815 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:44,849 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:44,849 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:45,986 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:46,011 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:46,011 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-24 12:11:46,012 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:46,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:11:46,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:11:46,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:11:46,013 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 33 states. [2018-10-24 12:11:46,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:46,218 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-24 12:11:46,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:11:46,219 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 100 [2018-10-24 12:11:46,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:46,220 INFO L225 Difference]: With dead ends: 111 [2018-10-24 12:11:46,220 INFO L226 Difference]: Without dead ends: 105 [2018-10-24 12:11:46,222 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:11:46,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-24 12:11:46,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-10-24 12:11:46,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-10-24 12:11:46,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 104 transitions. [2018-10-24 12:11:46,225 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 104 transitions. Word has length 100 [2018-10-24 12:11:46,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:46,226 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 104 transitions. [2018-10-24 12:11:46,226 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:11:46,226 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 104 transitions. [2018-10-24 12:11:46,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-10-24 12:11:46,227 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:46,227 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:46,227 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:46,227 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:46,227 INFO L82 PathProgramCache]: Analyzing trace with hash 124553219, now seen corresponding path program 30 times [2018-10-24 12:11:46,228 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:46,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:46,228 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:46,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:46,228 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:46,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:46,752 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:46,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:46,753 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:46,753 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:46,753 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:46,753 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:46,753 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:46,760 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:46,761 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:46,876 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:46,876 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:46,881 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:46,999 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:47,000 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:48,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:48,849 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:48,849 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-10-24 12:11:48,849 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:48,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:11:48,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:11:48,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-24 12:11:48,851 INFO L87 Difference]: Start difference. First operand 104 states and 104 transitions. Second operand 34 states. [2018-10-24 12:11:49,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:49,010 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-24 12:11:49,010 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:11:49,011 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 103 [2018-10-24 12:11:49,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:49,011 INFO L225 Difference]: With dead ends: 114 [2018-10-24 12:11:49,012 INFO L226 Difference]: Without dead ends: 108 [2018-10-24 12:11:49,013 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-24 12:11:49,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-10-24 12:11:49,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2018-10-24 12:11:49,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-24 12:11:49,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2018-10-24 12:11:49,017 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 103 [2018-10-24 12:11:49,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:49,017 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2018-10-24 12:11:49,017 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:11:49,017 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2018-10-24 12:11:49,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-10-24 12:11:49,018 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:49,018 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:49,018 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:49,019 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:49,019 INFO L82 PathProgramCache]: Analyzing trace with hash 806955834, now seen corresponding path program 31 times [2018-10-24 12:11:49,019 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:49,020 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:49,020 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:49,020 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:49,020 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:49,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:49,605 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:49,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:49,606 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:49,606 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:49,606 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:49,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:49,606 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:49,614 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:49,614 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:49,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:49,726 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:49,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:49,749 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:51,162 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:51,183 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:51,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-10-24 12:11:51,183 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:51,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:11:51,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:11:51,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:11:51,184 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 35 states. [2018-10-24 12:11:51,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:51,334 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-24 12:11:51,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:11:51,334 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 106 [2018-10-24 12:11:51,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:51,336 INFO L225 Difference]: With dead ends: 117 [2018-10-24 12:11:51,336 INFO L226 Difference]: Without dead ends: 111 [2018-10-24 12:11:51,337 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:11:51,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-24 12:11:51,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2018-10-24 12:11:51,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-24 12:11:51,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 110 transitions. [2018-10-24 12:11:51,341 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 110 transitions. Word has length 106 [2018-10-24 12:11:51,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:51,341 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 110 transitions. [2018-10-24 12:11:51,341 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:11:51,341 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 110 transitions. [2018-10-24 12:11:51,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:11:51,342 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:51,342 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:51,342 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:51,342 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:51,343 INFO L82 PathProgramCache]: Analyzing trace with hash -2111919965, now seen corresponding path program 32 times [2018-10-24 12:11:51,343 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:51,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:51,344 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:51,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:51,344 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:51,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:51,893 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:51,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:51,894 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:51,894 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:51,894 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:51,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:51,894 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:51,901 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:51,902 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:12:26,507 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-24 12:12:26,507 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:26,521 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:26,554 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:26,554 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:27,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:27,771 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:27,771 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-10-24 12:12:27,771 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:27,772 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:12:27,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:12:27,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:12:27,773 INFO L87 Difference]: Start difference. First operand 110 states and 110 transitions. Second operand 36 states. [2018-10-24 12:12:27,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:27,907 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-24 12:12:27,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:12:27,908 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 109 [2018-10-24 12:12:27,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:27,909 INFO L225 Difference]: With dead ends: 120 [2018-10-24 12:12:27,909 INFO L226 Difference]: Without dead ends: 114 [2018-10-24 12:12:27,910 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:12:27,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-24 12:12:27,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2018-10-24 12:12:27,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-10-24 12:12:27,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2018-10-24 12:12:27,914 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 109 [2018-10-24 12:12:27,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:27,915 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2018-10-24 12:12:27,915 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:12:27,915 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2018-10-24 12:12:27,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2018-10-24 12:12:27,916 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:27,916 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:27,916 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:27,916 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:27,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1861994138, now seen corresponding path program 33 times [2018-10-24 12:12:27,917 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:27,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:27,917 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:27,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:27,918 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:27,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:28,515 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:28,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:28,515 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:28,515 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:28,515 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:28,516 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:28,516 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:12:28,522 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:12:28,523 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:12:28,647 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:12:28,647 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:28,652 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:28,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:28,742 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:30,148 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:30,170 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:30,170 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2018-10-24 12:12:30,170 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:30,170 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:12:30,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:12:30,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-10-24 12:12:30,171 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 37 states. [2018-10-24 12:12:30,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:30,319 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-24 12:12:30,320 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 12:12:30,320 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 112 [2018-10-24 12:12:30,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:30,321 INFO L225 Difference]: With dead ends: 123 [2018-10-24 12:12:30,321 INFO L226 Difference]: Without dead ends: 117 [2018-10-24 12:12:30,321 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-10-24 12:12:30,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-24 12:12:30,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2018-10-24 12:12:30,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-10-24 12:12:30,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 116 transitions. [2018-10-24 12:12:30,324 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 116 transitions. Word has length 112 [2018-10-24 12:12:30,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:30,325 INFO L481 AbstractCegarLoop]: Abstraction has 116 states and 116 transitions. [2018-10-24 12:12:30,325 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:12:30,325 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 116 transitions. [2018-10-24 12:12:30,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-10-24 12:12:30,325 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:30,325 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:30,326 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:30,326 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:30,326 INFO L82 PathProgramCache]: Analyzing trace with hash -2036477629, now seen corresponding path program 34 times [2018-10-24 12:12:30,326 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:30,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:30,327 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:30,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:30,327 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:30,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:30,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:30,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:30,926 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:30,926 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:30,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:30,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:30,926 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:12:30,935 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:30,935 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:12:31,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:31,066 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:31,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:31,184 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:32,662 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:32,684 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:32,684 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-10-24 12:12:32,684 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:32,684 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:12:32,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:12:32,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:12:32,685 INFO L87 Difference]: Start difference. First operand 116 states and 116 transitions. Second operand 38 states. [2018-10-24 12:12:32,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:32,812 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-24 12:12:32,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:12:32,812 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 115 [2018-10-24 12:12:32,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:32,814 INFO L225 Difference]: With dead ends: 126 [2018-10-24 12:12:32,814 INFO L226 Difference]: Without dead ends: 120 [2018-10-24 12:12:32,815 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:12:32,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-10-24 12:12:32,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2018-10-24 12:12:32,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-24 12:12:32,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2018-10-24 12:12:32,818 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 115 [2018-10-24 12:12:32,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:32,819 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2018-10-24 12:12:32,819 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:12:32,819 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2018-10-24 12:12:32,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-10-24 12:12:32,820 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:32,820 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:32,820 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:32,820 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:32,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1198237190, now seen corresponding path program 35 times [2018-10-24 12:12:32,821 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:32,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:32,821 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:32,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:32,822 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:32,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:33,445 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:33,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:33,445 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:33,445 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:33,446 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:33,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:33,446 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:12:33,453 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:12:33,454 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:13:27,888 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-24 12:13:27,888 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:27,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:28,031 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:28,031 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:29,709 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:29,742 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:29,742 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-10-24 12:13:29,742 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:29,742 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:13:29,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:13:29,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:13:29,743 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 39 states. [2018-10-24 12:13:29,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:29,887 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-24 12:13:29,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:13:29,888 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 118 [2018-10-24 12:13:29,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:29,889 INFO L225 Difference]: With dead ends: 129 [2018-10-24 12:13:29,889 INFO L226 Difference]: Without dead ends: 123 [2018-10-24 12:13:29,890 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:13:29,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-24 12:13:29,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-10-24 12:13:29,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-24 12:13:29,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 122 transitions. [2018-10-24 12:13:29,893 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 122 transitions. Word has length 118 [2018-10-24 12:13:29,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:29,894 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 122 transitions. [2018-10-24 12:13:29,894 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:13:29,894 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 122 transitions. [2018-10-24 12:13:29,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-10-24 12:13:29,894 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:29,895 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:29,895 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:29,895 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:29,895 INFO L82 PathProgramCache]: Analyzing trace with hash -117177885, now seen corresponding path program 36 times [2018-10-24 12:13:29,895 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:29,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:29,896 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:29,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:29,896 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:29,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:30,592 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:30,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:30,592 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:30,592 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:30,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:30,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:30,593 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:13:30,599 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:13:30,600 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:13:30,735 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:13:30,735 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:30,739 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:30,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:30,766 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:32,666 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:32,688 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:32,688 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-10-24 12:13:32,688 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:32,688 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:13:32,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:13:32,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:13:32,689 INFO L87 Difference]: Start difference. First operand 122 states and 122 transitions. Second operand 40 states. [2018-10-24 12:13:33,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:33,366 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-24 12:13:33,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:13:33,367 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 121 [2018-10-24 12:13:33,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:33,368 INFO L225 Difference]: With dead ends: 132 [2018-10-24 12:13:33,368 INFO L226 Difference]: Without dead ends: 126 [2018-10-24 12:13:33,369 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:13:33,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-24 12:13:33,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2018-10-24 12:13:33,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-10-24 12:13:33,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2018-10-24 12:13:33,372 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 121 [2018-10-24 12:13:33,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:33,373 INFO L481 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2018-10-24 12:13:33,373 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:13:33,373 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2018-10-24 12:13:33,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-10-24 12:13:33,373 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:33,374 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:33,374 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:33,374 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:33,374 INFO L82 PathProgramCache]: Analyzing trace with hash 2055791962, now seen corresponding path program 37 times [2018-10-24 12:13:33,374 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:33,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:33,375 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:33,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:33,375 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:33,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:34,124 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:34,124 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:34,124 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:34,124 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:34,125 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:34,125 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:34,125 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:13:34,132 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:34,132 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:13:34,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:34,277 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:34,409 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:34,410 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:37,264 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:37,285 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:37,285 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-10-24 12:13:37,285 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:37,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:13:37,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:13:37,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:13:37,287 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 41 states. [2018-10-24 12:13:37,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:37,605 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-24 12:13:37,606 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:13:37,606 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 124 [2018-10-24 12:13:37,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:37,607 INFO L225 Difference]: With dead ends: 135 [2018-10-24 12:13:37,607 INFO L226 Difference]: Without dead ends: 129 [2018-10-24 12:13:37,607 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:13:37,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-24 12:13:37,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2018-10-24 12:13:37,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:13:37,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 128 transitions. [2018-10-24 12:13:37,612 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 128 transitions. Word has length 124 [2018-10-24 12:13:37,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:37,613 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 128 transitions. [2018-10-24 12:13:37,613 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:13:37,613 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 128 transitions. [2018-10-24 12:13:37,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-10-24 12:13:37,614 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:37,614 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:37,614 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:37,614 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:37,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1041548669, now seen corresponding path program 38 times [2018-10-24 12:13:37,614 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:37,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:37,615 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:37,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:37,615 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:37,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:38,632 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:13:38,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:38,633 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:38,633 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:38,633 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:38,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:38,633 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:13:38,640 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:13:38,640 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown